Arrhythmias are abnormal heart rhythm and heart beat.There are many types of arrhythmias.They are categorized by some doctors by where they start in the heart (the atria, AV node, or the ventricles).When an arrhythmia occurs, the heart can beat too fast, too slow, or with an irregular rhythm.Tachycardia is a heartbeat that is too fast.Bradycardia is a heartbeat that is too slow.Most arrhythmias are harmless, but some can be serious or even life threatening.The four main types of arrhythmia are:1. Premature (Extra) BeatsPremature beats are the most frequent type of arrhythmia.They are not harmful most of the time and often do not produce any symptoms.When symptoms do happen, they normally feel like the fluttering in the chest or a feeling of a skipped heartbeat.Most of the time, premature beats do not require treatment, particularly in healthy people.2. Supra-ventricular ArrhythmiasSupra-ventricular arrhythmias are tachycardias (fast heart rates) that begin in the atria or atrioventricular (AV) node.The AV node is a collection of cells sited between the atria and the ventricles.Atrial FibrillationAF is the most frequent type of serious arrhythmia.Signals may move throughout the atria in a rapid, disorganized way.These cause the walls of the atria to quiver very fast (fibrillate) instead of beating normally.As a result, the atria are not capable of pumping blood into the ventricles the way they should.In AF, electrical signals can travel through the atria at a rate of more than 300 per minute.Atrial FlutterThe heart's electrical signals spread through the atria in a fast and regular—instead of irregular—rhythm.Paroxysmal Supra-ventricular TachycardiaPSVT is a very fast heart rate that begins and ends suddenly.PSVT happens because of disorders with the electrical connection between the atria and the ventricles.A special form of PSVT is termed Wolff-Parkinson-White syndrome.Ventricular ArrhythmiasThese arrhythmias begin in the heart's lower chambers, the ventricles.They can be very risky and normally need medical care right away.Ventricular tachycardia is a fast, regular beating of the ventricles that may persist for only a few seconds or for much longer.Ventricular fibrillation (v-fib) happens if disorganized electrical signals induce the ventricles to quiver instead of pump normally.Brady-arrhythmiasBrady-arrhythmias happen if the heart rate is slower than normal.If the heart rate is too slow, not enough blood enters the brain.This can induce the patient to faint.Frequent symptoms are:1. Palpitations, feeling "skipped beats"2. Thumping or fluttering in the chest3. Racing heart sensationAlso, some can have symptoms that are more generalized, such as:1. Feeling faint or tired2. Light-headedness or passing out (syncope)3. Shortness of breath4. Chest pain or discomfortThe most successful way to diagnose an arrhythmia is with an electrical recording of the heart rhythm called an electrocardiogram (ECG).2. This is the use of a Holter monitor or ambulatory ECG monitoring wearing a small portable ECG recording device for 24 hours or longer.The treatments used for arrhythmias are:1. Medication to stop or prevent an arrhythmia or control the rate of an arrhythmia2. Electrical Cardioversion3. Catheter ablation4. Pacemaker5. Implantable Cardioverter Defibrillator - ICD6. Cardiac Implantable Electronic Device Replacement7. Heart Surgery for Atrial Fibrillation - MAZE8. The life vest is a personal defibrillator worn by a patient at risk for sudden cardiac arrest.TABLE OF CONTENTIntroductionChapter 1 Heart ArrhythmiasChapter 2 Atrial FlutterChapter 3 Atrial FibrillationChapter 4 Ventricular FibrillationChapter 5 Sick Sinus SyndromeChapter 6 Wolff-Parkinson-White SyndromeChapter 7 Extra-systole...